He followed that with: "But don't worry...I'll be drinking my pee again soon!"

He then wrote a quote from American self-improvement motivator Dale Carnegie: "All life is a chance. So take it! The person who goes furthest is the one who is willing to do and dare."

Then, just a day later, Grylls confirmed he was already working on a new show.

"Training hard today - gearing up for new missions! As my dad said: life is meant to be one great big adventure!"

He hasn't yet given any interviews, but after his axing Grylls' spokeswoman Heather Krug told the Hollywood Reporter: "Bear's goal has always been to make life-empowering shows for his many fans around the globe, and he has taken great risks to bring Discovery such award-winning programming over seven seasons.

"Bear has loved the Man vs Wild journey and looks forward to producing further cutting edge content again soon for his loyal audience."

The Hollywood Reporter suggested Grylls, 37, was fired for refusing to star in two unannounced shows he was contracted for.

Grylls starred in seven seasons of Man vs Wild. Each episode features Grylls taking on dangerous stunts, sleeping in the wild and eating something disgusting - usually some kind of dead animal. During season three, he drank his own urine out of the skin of a snake.

The most recent season showed Grylls spending two episodes in New Zealand.